New Mechanisms of Shear-Driven Plasma Turbulence

剪切驱动等离子体湍流的新机制

• 批准号: 9816261
• 负责人: Mark Koepke
• 金额: $ 30万
• 依托单位: West Virginia University Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-01 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9816261&HistoricalAwards=false
• 关键词: New; Mechanisms; Shear; Driven; Plasma

This research program will utilize the West Virginia University Q Machine to perform an experimental study of plasma turbulence that is driven by velocity shear structures. The ion-cyclotron and ion-acoustic plasma instabilities are known to be important in the generation and propagation of waves in the magnetosphere and the ionosphere. It has been found that inhomogeneities in perpendicular flows have been shown to significantly decrease the threshold at which these plasma instabilities may be excited. Laboratory experiments will be performed to elucidate the roles of the different mechanisms that have been identified, might lead to enhanced growth rates of these instabilities. The expermental results will have direct application to wave phenomena observed in the magnetosphere and ionosphere.

这项研究计划将利用西弗吉尼亚大学Q机进行等离子体湍流的实验研究，是由速度剪切结构驱动。 离子回旋不稳定性和离子声等离子体不稳定性在磁层和电离层中的波的产生和传播中是重要的。 已经发现，垂直流中的不均匀性已经显示出显着降低这些等离子体不稳定性可能被激发的阈值。 将进行实验室实验，以阐明已确定的不同机制的作用，可能会导致这些不稳定性的增长率提高。 实验结果将直接应用于磁层和电离层中观测到的波动现象。